/Engine/Source/Runtime/AIModule/Public/BehaviorTreeDelegates.h
Delegate type for tree execution events (Params: const UBehaviorTreeComponent* OwnerComp, const UBehaviorTree* TreeAsset)
typedef TMulticastDelegate_TwoParams< void, const [UBehaviorTreeComponent](API\Runtime\AIModule\BehaviorTree\UBehaviorTreeComponent) &, const [UBehaviorTree](API\Runtime\AIModule\BehaviorTree\UBehaviorTree) & > FOnTreeStarted